xref: /freebsd/lib/libc/stdio/perror.c (revision a2aef24aa3c8458e4036735dd6928b4ef77294e5)
1 /*
2  * Copyright (c) 1988, 1993
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. Neither the name of the University nor the names of its contributors
14  *    may be used to endorse or promote products derived from this software
15  *    without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  */
29 
30 #if defined(LIBC_SCCS) && !defined(lint)
31 static char sccsid[] = "@(#)perror.c	8.1 (Berkeley) 6/4/93";
32 #endif /* LIBC_SCCS and not lint */
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
35 
36 #include "namespace.h"
37 #include <sys/types.h>
38 #include <sys/uio.h>
39 #include <unistd.h>
40 #include <errno.h>
41 #include <limits.h>
42 #include <stdio.h>
43 #include <string.h>
44 #include "un-namespace.h"
45 #include "libc_private.h"
46 #include "local.h"
47 
48 void
49 perror(const char *s)
50 {
51 	char msgbuf[NL_TEXTMAX];
52 	struct iovec *v;
53 	struct iovec iov[4];
54 
55 	v = iov;
56 	if (s != NULL && *s != '\0') {
57 		v->iov_base = (char *)s;
58 		v->iov_len = strlen(s);
59 		v++;
60 		v->iov_base = ": ";
61 		v->iov_len = 2;
62 		v++;
63 	}
64 	strerror_r(errno, msgbuf, sizeof(msgbuf));
65 	v->iov_base = msgbuf;
66 	v->iov_len = strlen(v->iov_base);
67 	v++;
68 	v->iov_base = "\n";
69 	v->iov_len = 1;
70 	FLOCKFILE_CANCELSAFE(stderr);
71 	__sflush(stderr);
72 	(void)_writev(stderr->_file, iov, (v - iov) + 1);
73 	stderr->_flags &= ~__SOFF;
74 	FUNLOCKFILE_CANCELSAFE();
75 }
76